Sebastian Vettel is braced for a difficult weekend in Canada admitting it will be tough "to match the Mercedes powered cars down the straights".The Circuit Gilles Villeneuve rewards strong engines due to its high-speed nature and Red Bull have found themselves limited thus far by a Renault unit which lacks the same output as Stuttgart marque's. "Historically we have struggled a little here - our approach in the past wasn't to be the fastest down the straights and this year I think we are still a little bit down in terms of power still," Vettel told reporters in Montreal. "So it will be difficult to match the Mercedes powered cars down the straights, but there are...
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